Improvement in air-pumps



UNITED STATES PATENT OFFICE.

JOHN H. WILHELM, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN AIR-PUMPS.

Specification forming part of Letters Patent No. 51,769, dated December26, 1865.

To all whom t may concern:

Be it known that 1, JOHN H. WILHELM, of Chicago, in the county ot Cookand State ot' Illinois, have invented an Improved Air- Pump Blow-Pipe;and I do hereby declare that the following is a full and exactdescription of the same, reference being had to the accompanyingdrawings and letters of reference marked thereon, making a part of thisspecification, in which- Figure lisa longitudinal elevation of myimproved air-pump blow-pipe. Fig. 2 is a transverse sectional elevationof the same.

The object of my invention is to construct an air-pump that will operateconveniently and effectually upon any kind ot' blow-pipes, butespecially upon those connected with the lamp shown at B, which Idenominate a petroleum hot-blast furnace-lamp.77

To enable others skilled in the art to make and use my invention, I willdescribe the method of constructing and using the same.

First, as a foundation and substantial part otl my device I use what Iterm the watertank 7 A, the two sides of which are inclined, as shown atFig. 2. To theinside of this tank and extending above the same andterminating in a circular or curved top, as shown at L, is theair-chamber which incloses the air-pump C. rIhe object of this elevatedairchamber is to allow the valve D to be placed at such a height abovethe water in the tank A as to prevent the water from being drawn intothe pump C by the action of the pumpstem F, and also to economize spacein constructing the air-chamberlarger than it otherwise could be withoutincreasing the size of the water-tank A. By this arrangement a largeamount of air accumulates in the airchamber L as it enters the air-pipeM, thus providing a constant supply of air to the airpipe M. A sideelevation or" the pump C is shown by the dotted lines C', Fig. l.

D represents the upper valve, E the lower valve, andF the stem, to thepump, which are used in operating the same.

At M is shown the pipe through which the airis discharged from theair-chamber L, and at O, at the end of the pipe M, is attached therubber tube through which the air is conducted to the lamp B.

At N is shown the stop-cock which is used in. regulating the force ofthe blast.

At P is represented the valve for discharging the surplus air from theair-chamber L, which would otherwise be thrown up violently through thewater in the tank A. The force or power of the valve P is regulated bythe spring c. The tank A is designed to be tilled with water to anypoint between the dotted lines I and H. The object of using this wateris, rst, to prevent the air from escaping from the air-chamber L in anyother direction than that described Iabove; second, for the purpose ofpressure on the air in the air-chamber L, as the pressure is partiallyremoved by the withdrawal of the stem F when the pump C is in operation,and by this means giving' a constant and uniform force to the blast.

Operation: In the drawings, Fig. l, the-airpump blow-pipe isrepresented, the rubber tube T being attached thereto and connected withthe lamp B at V, and all parts adjusted for operation. The water-tank Ais supposed to be illed with water, as above described. Attach anydesired motive power to the stem F that will operate the same with aVelocity of from thirty to one hundred strokes per minute, according tothe size of the pump C and the force of the blast required. The water inthe tank A rises as the air is pumped into the air-chamber L by themovement of the stem F, being pressed upward by the confined air, andfalls as the stem F is withdrawn, pressing upon the air as it escapesthrough the air-pipe M, and thus producing aconstant blast. Care must betaken properly to regulate the stopcock O, so as to give the requiredblast upon the lamp B through the rubber tube T.

I do not claim the use of water for the purpose of pressure, nor the useof an air-chamber opening into water, nor of an air-pump used as suchindependently; but

What I do claim, and desire to secure by Letters Patent of the UnitedStates, is

The air-pump C, contained in the elevated air-chamber L, and water-tankA, substantially as set forth.

JOHN H. WILHELM. Witnesses:

G. L. GHAPIN, H. M. SHEPARD.

